I think that for Myst 3 there is no expiry - I believe Cyan licensed the right to use the Myst name, etc., to Presto but the creative work was all Presto's so it was their property - the game, the artwork, even the creatures. That property then passed to Mattel as the acquirer of the remnants of Presto and then subsequently to Ubisoft.

Mac - MOULagain KI#00004826 00004289In the interests of the environment, this post has been constructed entirely from recycled electrons.